Schafarzikite
Diffraction data computed using the structure from the paper listed below, 
along with the cell parameters refined from single crystal data of R120039
      Fischer R, Pertlik F
      Tschermaks Mineralogische und Petrographische Mitteilungen 22 (1975) 236-241
      Verfeinerung der kristallstruktur des schafarzikites, FeSb2O4
      Locality: Pernek, Slowakei, CSSR
      _database_code_amcsd 0015656

      CELL PARAMETERS:   8.6150  8.6150  5.9150   90.000   90.000   90.000
      SPACE GROUP: P4_2/mbc  

           ATOM        X         Y         Z     OCCUPANCY  ISO(B)
            Fe     0.00000   0.50000   0.25000     1.000     0.566
            Sb     0.17636   0.16587   0.00000     1.000     0.790
            O      0.67940   0.17940   0.25000     1.000     1.981
            O      0.10180   0.64120   0.00000     1.000     0.809

            X-RAY WAVELENGTH:     1.541838
            BOUNDS ON TWO THETA:    5.0  90.0
            LIMITS IMPOSED ON THE INDICES ARE:  +/-  7 +/-  7 +/-  5
            MAX. ABS. INTENSITY / VOLUME**2:      164.9604498    
            The INTENSITY cut off value is   1.00

               2-THETA      INTENSITY    D-SPACING   H   K   L
                14.54          4.05        6.0917    1   1   0
                20.62         14.78        4.3075    2   0   0
                27.63        100.00        3.2283    2   1   1
                29.32         14.27        3.0459    2   2   0
                30.22         10.77        2.9575    0   0   2
                32.88         21.28        2.7243    3   1   0
                33.69         10.13        2.6605    1   1   2
                36.87         21.44        2.4381    2   0   2
                38.37          3.81        2.3460    2   1   2
                41.95          1.23        2.1537    4   0   0
                44.62          4.20        2.0306    3   3   0
                45.25          2.19        2.0037    3   1   2
                46.07         30.94        1.9701    4   1   1
                47.18          4.61        1.9264    4   2   0
                52.11         15.55        1.7552    2   1   3
                52.57          7.45        1.7410    4   0   2
                54.84         20.70        1.6740    3   3   2
                59.90          6.64        1.5443    5   2   1
                62.84          4.09        1.4787    0   0   4
                62.90          5.31        1.4775    5   3   0
                63.40          5.66        1.4670    5   1   2
                64.95          5.74        1.4358    6   0   0
                65.04          9.75        1.4340    4   1   3
                70.83          1.65        1.3303    2   2   4
                71.36          2.41        1.3217    5   3   2
                71.98          5.47        1.3119    5   4   1
                72.77          3.77        1.2996    3   1   4
                73.29          1.99        1.2917    6   0   2
                76.72          2.97        1.2423    5   2   3
                77.09          3.97        1.2372    6   2   2
                80.32          1.50        1.1954    3   3   4
                82.18          1.41        1.1730    4   2   4
                83.27          3.42        1.1604    7   2   1
                85.95          3.11        1.1309    2   1   5
                86.37          1.06        1.1265    5   5   2
                87.84          3.02        1.1113    5   4   3
                88.21          1.89        1.1077    6   4   2
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       XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs
  For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.